I am looking at a computer that has PCI: 2 Slots PCIe x1: 1 Slot PCIe x16 (Graphics): 1 Slot Someone (Dell representative) had told me that only the PCIe x16 slot would work for a graphics card. Is this true? The other slots are not compatible with graphic cards? Cuz looking at some of the commonly used cards out there, they say they are compatible with all compliant PCI or PCIe slots (i.e. x1, x4, x8, x16).